A、damaged intake valves
B、excessively tight mounting bolts
C、insufficient cylinder lubrication
D、a loose piston
更多“A knocking sound emitted from an unloaded air compressor is probably caused by （）.”相关的问题
A、a defective or broken high pressure un-loader B、a loose valve plate C、excessive overload D、no compression
A、Should knocking occur B、If knocking occur C、Should if knocking occurs D、If occur knocking
A、high exhaust temperature B、low exhaust temperature C、fuel knock in each cylinder D、mechanical knock in each cylinder
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